Ship propulsion.



H. ZOELLY.

SHIP PROPULSION.

APPLICATION FILED MAY 26. 1914.

1 1 58,61 7. Patented Nov. 2, 1915.

* STATES *PATENTOFFICE.

HEINRICH ZOELIQY, OF ZURICH, SWITZERLAND, ASSIGNOB TOESCHEB, WYSS & 60.,A

CORPORATION OF S?I'JIZERIILAIN'I). u I

' SHIP PROPULSION.

Specification of Letters I'atent.

Application filed Kay 26, 1914. Serial No. 840,972.

To all whom it may concern:

Be it known that I, HEINRICH ZonLLY, a

. citizen of the Republic of Switzerland, re-

siding at Zurich, in the Republic of Switzerland, have invented certainnew and useful Improvements in Ship Propulsion, of which the followingis a full, clear, and exact specificatiom v This invention relates to adriving arrangement fol-[screw-propelled ships provided with at leastthree shafts and dr1ven by steam and electric power.

The invention resides in the fact that at least two shafts are. drivensolely by steam turbines and that the other shaft or shafts are drivensolely by electromotors in which action the electromotor orelectromotors is or are fed from at least one turbo-dynamo, thearrangement being suchthat in the case of cruising speed theelectrically driven shaft or shafts perform the main Work and the wastesteam from the auxiliary turbines driving the dynamos is caused to enteralways a high pressure stage of the propeller steamturbines, whereas inthe case of full-' speed the steam-propelled shafts perform the mainwork. g

It has already been proposed to provide driving means for screwpropelled ships in which both steam and, electric power aresimultaneously, employed. In this known case, however, the arrangementis such that a steam turbine as well as an electromotor are mounted onone and the same shaft. This circumstance necessitates a very expensiveand what is more important a veryv heavy engine plant which on accountofits great polar momentum of inertia of the rotating masses renders itscontrol extremely diflicult. Now according to this invention the almvegreat drawback is obviated without dispensing with the known and greatprincipally destined for full speed-and are driven by large steamturbines 9 and 10. The turbines may in the usual manner he also coupledwitlrreversing turbines. If it is deslred to drive the ship for alongtime at a slow speed, the two inner shafts 1 and 2 are used toperform, the principal work required. In order, however, that the propelers on the two outer shafts 3 and 4 are not merely dragged alongwhereby as experiencehas shown a very high resistance would be producedthe steamconduit is so arranged that the auxiliary turbine 7 driven byfresh steam delivers its exhaust to the two large turbines 9 and 10 incausing it to name Nov, 2, 1915.

enter each turbine into a pressure stage which is clgse to the inlet ofthe live steam, for instance, at 11 in the turbine 9 and at 12 in theturbine 10. The steam then continues to operate in these large turbines9 and 10 which are thus connected in parallel until it reaches condenserpressure and it drives the-outer shafts 3 and 4 in-the same sense of theships movement in which the electromotors 5 and 6 drive the shafts 1 and2. Now if theship is run at a higher speed, live steam is supplied tothe turbines 9 and 10 in a known manner in which it is caused to expandto condenser pressure and in this action gives off a great amount ofwork to the outershafts 3 and 4 so that the latter are caused to rotateat an increased speed. Now in order that the propellers on theinner'shafts 1 and 2 are not merely, dragged along but that they shouldaid the two outer shafts the motors on shaft 1 and 2 are to be driven ata higher speed. This can be done either by increasing the speed of theauxiliary turbine.

7, or by changing the pole connections on the dynamo 8 (or on the motors5 and 6) in order to increase the periodicity of the current produced,and thereby the revolutions of the motors 5 and 6 if alternating currentisused, orbychanging the electric resistances should the current becontinuous. The electromotors 5 and 6 rotating more rapidly are therebyaiding the steam turbines 9' and 10 in the delivery of their energy tothe ship. The steam used up by the auxiliary turbine 7 is now introducedinto lower stages of the turbines 9 and 10, say at 13 and 14respectively. so that it may continue its work in the lower stages ofthe main turbines. If

8 is acoutinuous current dynamo and should it be tl isll fd. to drive itat a lower speed speeds and maneuvering. ability, and will be .1 haveample provision therefor, as well asve v he invention 1s special areduction gear may be fitted between turbine '7 and dynamo 8.

The low or cruising speed afts 1 and2 are referably symmetricallyarranged relative y to the axis-or center line of the ship.

If only one is used, it would preferably be located. axially in theship. It will be seen that a ship equipped with three or more propellersdriven according' to this invention will have a wide range of economicalfor cruising.

y advantageous for ships of war, which are seldom required to travel atmaximum speed, but which must for handling in maneuvers.

While I have not shown herein the boiler, H piping and valves fordirectly supplying the turbines 9 and 10 with high pressure steam, northe various steam and electrical 0on trolling appliances, nor thecondensers, such a pliances will be well understood and appied withoutfurther description or illustration, and are unnecessary to a fullunderstanding of this invention. The controls will preferably be capableof driving some or al propellers in the same or reverse directions, soas to give ample opportunity for turning, etc., in evolutions Variousmodifications and changes may be. made without departing from the scopeI of the appended claims.

Having thus de ribed my invention, declare that what I laim as new anddesire to secure by Letters Patent, is

1. The combination of at least three propeller shafts, means for drivingcertain of said shafts solely by steam to obtain one speed ofpropulsion, and means for driving the remaining shafts solely-byelectric mo- ,tors to obtain another speed of propulsion.

2. The combination of at least three pro-.

peller shafts, steam driving means alone for certain .of said shaftsfurnishing the main driving power at one speed, and electrical drivingmeans alone for the remainingshafts furnishing the maindriving power at'a leser speed.

3. The combination of at least three peller shafts, steam driving meansalone for two of said shafts, electric motors alone for current'forsaidmotors, and "means for hausting the steam from the high dynamoturbine into the steam means of the steam driven propellermetal. 5.In'combination with a ship having two sets of propellers, turbine meansfor directly.

. driving one set, and turbo-electric means for driving the other set,and means preven developing propulsion power.-

6; In com 'dynamo turbine furnishin power for said electrically drivensteam driven propel and means for supplying the direct steam drivingmeans with exhaust steam from the dynamo turbine.

7. In combination with a d1ip,a turbine and direct connected dynamo, a

shaft, 'anelectric motor con p p dynamo for driving said shaft, a second1 0- peller-and shaft a direct driving 'tur in'e therefor, and means forsupplying exhaud;

over said direct turbine. 8. In combination with a shims dynamo turbineand direct connected dynamo,

5 peller shaft, an electric motor connected .10 dragging of the idlesetzwhen the other set ll v ination with a ship, electrically drivenpropeller shafts for cruising speed, a

15- rope er shafts, directliar shafts for full speed,

steam from said dynamo turbin u; tum

said dynamo for driving said shaft, a second propeller and shaft, a.direct'fdrivi bine therefor, means for'supplying e steam from saiddynamo turbine tetum met.

over said direct turbine, and means for supplyinghigh pressure steam tosaid d rect 1 turbine at another point.

9-. In combinationwith a ship, dynamo turbine and direct connecteddynamo, apro.

peller shaft, an electric motor eonnmd to said dynamo for driving saidshaft, a

propeller and shaft, a direct driving multistage turbine therefor, andmeans for'supplying exhaust steam from said dynamo turbine to anintermediate stage of said direct driving turbine.

10. In'combination with a dlip, a dynamo turbine and direct connecteddynamo, a peller shaft, an electric motor conn said dynamo for drivingsaid shaft, a Lloond propeller shaft and a multi-stage propellerturbine, direct connected thereto, means for: delivering exhaust steamfrom said dynamo turbine to ahigher'prem're P to stage of said propellerturbine when theship v is running at cruising speedthan when running atfull speed.

In testimony whereof I ailix my signature,

in presence of two witnesses with 0A Hurmmion HEINRICH eems,

